Thank you for being such a wonderful community! I've been a long time lurker of these forums when I began my journey into the Audiophile world. As of right I've only slightly delved into the realm of Audiophile grade products. Like most others, I've started from the ground up. I currently own the highly regarded Audio Technica ATH-M50s as well as the Shure SRH 440s. In terms of DAC/Amps I currently own the Fiio E07K as it fit my needs at the time of purchase. With Black Friday and Cyber Monday rapidly approaching I've been debating making the leap into Planar Magnetics with a killer deal on the Hifiman He-400s. Can anyone please shed some light as to whether someone who is so accustomed to traditional dynamic over-ears will be blown away by an entry level planar magnetic such as the He-400? I enjoy the neutral sound signature of the SRH440 as well as the slightly warmer M50s. Due to my varying taste in music genres, I'm hoping to find something that is pretty well rounded. What might I expect from upgrading from these headphones to planar magnetic? Also, can anyone recommend a nice desktop USB DAC/Amp that is well suited for the He-400s (Preferably under $300 USD)? Any help is very much appreciated!! Thanks again in advance!!